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Duplicate IP messed up my LAN

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Duplicate IP messed up my LAN

yulipurnomoajie
Hi guys, i have a LAN for internet sharing which uses a Fedora 5 server for DHCP,DNS and internet gateway with IP address 192.168.0.1. Several days a go i had a client that pluged his laptop into the LAN using manual ip address 192.168.0.1 and what happened next was all other clients cannot connect to the internet because (my assumption) the gateway address has been spoofed by my client's laptop IP. Any solution for this guys? thanks in advance.
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    scott_heath

    For that sort of weirdness. I've seen that happen at other places I have worked. Home networks often use the 192.168.x.x scheme so for private IPs at work I use the 10.x.x.x. I know re-IPing your network is probably out of the question, but 10.x.x.x is definately more rare for home users and has a large spectrum to choose from.

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    yulipurnomoajie

    hmm..that could be a solution too, but what if someone know the new ip address of gateway server let say 10.0.0.1 and set the same address to his/her laptop just want to disturb my LAN?:D

    I just wondered, when a device with an ip address plugged in to a LAN which has the same address in it, i don't see any ip conflict notification, why is it?

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    scott_heath

    What sort of notification are you refering to? The person who turned ther system on should have gotten notification on their screen.

    You can't really stop someone from doing it easily if they want to do it on purpose. I was talking about preventing accidental issues.

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    scott_heath

    For that sort of weirdness. I've seen that happen at other places I have worked. Home networks often use the 192.168.x.x scheme so for private IPs at work I use the 10.x.x.x. I know re-IPing your network is probably out of the question, but 10.x.x.x is definately more rare for home users and has a large spectrum to choose from.

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    yulipurnomoajie

    hmm..that could be a solution too, but what if someone know the new ip address of gateway server let say 10.0.0.1 and set the same address to his/her laptop just want to disturb my LAN?:D

    I just wondered, when a device with an ip address plugged in to a LAN which has the same address in it, i don't see any ip conflict notification, why is it?

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    0 Votes
    scott_heath

    What sort of notification are you refering to? The person who turned ther system on should have gotten notification on their screen.

    You can't really stop someone from doing it easily if they want to do it on purpose. I was talking about preventing accidental issues.